WO2007023703A1 - Affichage à cristaux liquides et plaque de guidage de lumière - Google Patents

Affichage à cristaux liquides et plaque de guidage de lumière Download PDF

Info

Publication number
WO2007023703A1
WO2007023703A1 PCT/JP2006/315998 JP2006315998W WO2007023703A1 WO 2007023703 A1 WO2007023703 A1 WO 2007023703A1 JP 2006315998 W JP2006315998 W JP 2006315998W WO 2007023703 A1 WO2007023703 A1 WO 2007023703A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
light guide
guide plate
crystal display
light
Prior art date
Application number
PCT/JP2006/315998
Other languages
English (en)
Japanese (ja)
Inventor
Tadahiro Ohmi
Yasuyuki Shirai
Kiwamu Takehisa
Mitsuo Matsumoto
Tokuo Ikari
Toshiaki Sato
Ikuo Onishi
Etsuo Nakazato
Yuichiro Yamada
Tokihiko Shinomiya
Takashi Ishizumi
Yuhsaku Ajichi
Original Assignee
Tohoku University
Kuraray Co., Ltd.
Sharp Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tohoku University, Kuraray Co., Ltd., Sharp Corporation filed Critical Tohoku University
Priority to US11/990,751 priority Critical patent/US8130340B2/en
Priority to CN2006800303347A priority patent/CN101243355B/zh
Publication of WO2007023703A1 publication Critical patent/WO2007023703A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to a liquid crystal display, and more particularly to a structure of a large liquid crystal display using a hot cathode fluorescent lamp as a backlight.
  • a liquid crystal display has a liquid crystal panel and a backlight unit for irradiating white light on the back surface of the liquid crystal panel.
  • a light guide plate is arranged on the back side of the liquid crystal panel as a structure of the knock light unit, and one or both sides of the light guide plate are arranged.
  • a structure in which a fluorescent lamp as a light source is disposed is adopted. According to this structure, light from the fluorescent lamp enters the light guide plate at the end face force of the light guide plate, and propagates through the light guide plate while part of the light is directed to the back surface of the liquid crystal panel. Is done.
  • the light guide plate it is possible to uniformly irradiate the back surface of the liquid crystal panel.
  • a fluorescent lamp used as a light source for a backlight unit of a liquid crystal display is a fluorescent lamp coated on the inner surface of a mercury lamp (more precisely, a low-pressure mercury vapor discharge lamp).
  • Mercury lamps are divided into a hot cathode type that emits light by thermionic emission and a cold cathode type that emits light by secondary electron emission, depending on the light emission mechanism.
  • Cold cathode fluorescent lamps have a lifespan of about 50,000 hours, and are five times longer than hot cathode lamps with a lifetime of around 10,000 hours.
  • Cathode-type fluorescent lamps are used.
  • the knock light unit is also required to increase the amount of light. This increase in the amount of light can be dealt with by increasing the number of fluorescent lamps.
  • the back side has a V-shaped groove structure so that the thickness of the light guide plate decreases toward the center of the screen so that light can be efficiently directed to the liquid crystal panel.
  • it is designed to achieve a light weight (for example, see Patent Document 1).
  • the cold cathode fluorescent lamp has a problem that even if the tube diameter is increased in order to increase the light emission amount per lamp, the luminous efficiency decreases in inverse proportion to the tube diameter, resulting in an increase in power consumption.
  • a hot cathode type is used instead of a cold cathode type as a fluorescent lamp used in a backlight unit for the purpose of reducing power consumption (for example, , See Patent Document 2.)
  • the hot-cathode fluorescent lamp is more than twice as high as the cold-cathode fluorescent lamp, and the luminous efficiency is reduced.
  • the luminous efficiency decreases even if the tube diameter is increased to increase the amount of light. do not do.
  • lighting fixtures with a diameter of about 30 mm have already been used that can produce a light emission amount (total luminous flux) of 2000 lumens or more (about 10 times the light intensity of a cold cathode tube with a diameter of 2 to 3 mm). ing.
  • Patent Document 1 Japanese Patent Laid-Open No. 2001-228477 (especially abstract and paragraph 0005)
  • Patent Document 2 JP 2000-187211 A (particularly paragraph 0003)
  • the cold cathode fluorescent lamp used in the conventional liquid crystal display has a diameter of 2 to 3 mm, whereas the hot cathode fluorescent lamp has a very large diameter of 20 to 30 mm. Further, the width of the end face of the light guide plate (thickness of the light guide plate) needs to be larger than the diameter of the fluorescent lamp in order to make light from the fluorescent lamp enter efficiently. For this reason, in the knock light unit using a hot cathode fluorescent lamp as the light source, the width of the end face of the light guide plate is about 40 mm.
  • the surface (main surface) has an area of about 7500 cm 2 , the thickness of the light guide plate is constant, and the translucent plastic constituting the light guide plate Assuming that the specific gravity is 1, the weight is about 30kg.
  • the thickness must be Omm. In other words, with a V-shaped groove structure on the back side of the light guide plate, it is impossible to reduce the weight of the light guide plate to 1Z2 or less compared to the case where the thickness is constant.
  • An object of the present invention is a light guide plate that can correspond to a hot cathode fluorescent lamp, and replaces a light guide plate or a light guide plate having a weight of 1Z2 or less as compared with a light guide plate having a constant thickness (cuboid).
  • the aim is to provide a lightweight reflector and a large liquid crystal display that is lightweight.
  • a plurality of linear or rod-shaped light sources arranged substantially in parallel, a light guide plate arranged so that the longitudinal direction is substantially parallel to the light source, Reflecting means provided on the back surface of the light guide plate, a liquid crystal panel provided on the front surface facing the back surface, and transflective means provided between the light guide plate and the liquid crystal panel.
  • the light guide plate is characterized in that the thickness of the light guide plate decreases as it advances from the end face where light from the light source enters to the inside, and the end face swells into a convex lens shape. A liquid crystal display is obtained.
  • a plurality of linear or rod-shaped light sources arranged substantially in parallel, a light guide plate including a plurality of grooves for accommodating the light sources, and a back surface of the light guide plate
  • a liquid crystal display having a reflecting means provided on the front surface, a liquid crystal panel provided on the front surface facing the back surface, and a transflective means provided between the light guide plate and the liquid crystal panel.
  • the display is characterized in that the thickness of the light guide plate becomes thinner as the end face force to which light from the light source enters becomes farther, and the end face swells like a convex lens.
  • the hot cathode As the type fluorescent lamp, there is obtained a liquid crystal display characterized in that a hot cathode fluorescent lamp is used in which the diameter of the intermediate portion connecting the both ends is smaller than the diameter of both ends of the tube.
  • a front surface and a back surface facing each other, and an end surface connecting the front surface and the back surface, and light incident on the end surface from a light source is emitted from the surface.
  • a light guide plate for projecting a light guide plate characterized in that the front surface is a flat surface, the back surface is a concave curved surface, and the thickness decreases as the distance of the light source power increases.
  • a liquid crystal display comprising: the light guide plate according to the fourth aspect; and a liquid crystal panel disposed on a surface side of the light guide plate. Is obtained.
  • a transparent flat plate, a light source, and a back surface of the flat plate are arranged so as to cover the back surface of the flat plate, and light from the light source is applied to the back surface of the flat plate.
  • a liquid crystal display comprising a reflector to be incident and a liquid crystal panel arranged on the surface side of the flat plate is obtained.
  • the thickness of the light guide plate is reduced as it advances from the end surface where the light of the fluorescent lamp enters to the inside, and the surface on which the fluorescent lamp force is incident is expanded into a convex lens shape.
  • the weight can be reduced to 1Z2 or less, and the weight of the liquid crystal display can be reduced.
  • the width of the end face of the light guide plate that is, the thickness of the light guide plate is further reduced.
  • the weight of the light guide plate and thus the liquid crystal display can be further reduced.
  • the back surface of the light guide plate a concave curved surface, it is possible to further reduce the weight of the light guide plate with a conventional V-shaped groove structure. Can realize cocoons.
  • FIG. 1 is a vertical view showing a schematic configuration of a large-sized liquid crystal display according to a first embodiment of the invention. It is sectional drawing.
  • ⁇ 2] (a) is a diagram showing an example of a white light traveling path when the end face of the light guide plate is flat, and (b) is an example of a white light traveling path when the end face of the light guide plate is convex.
  • FIG. 3 is an enlarged view inside the dotted circle in FIG.
  • IV is a front view showing a schematic configuration of a large-sized liquid crystal display according to a second embodiment of the present invention.
  • FIG. 5 is a longitudinal sectional view showing a schematic configuration of a large-sized liquid crystal display according to a third embodiment of the present invention.
  • FIG. 6 is a longitudinal sectional view showing a schematic configuration of a large-sized liquid crystal display according to a fourth embodiment of the present invention.
  • FIG. 7 is a longitudinal sectional view showing a schematic configuration of a large-sized liquid crystal display according to a fifth embodiment of the present invention.
  • FIG. 8 is a longitudinal sectional view showing a schematic configuration of a large-sized liquid crystal display according to a sixth embodiment of the present invention.
  • FIG. 9 is a longitudinal sectional view showing a schematic configuration of a large-sized liquid crystal display according to a seventh embodiment of the present invention.
  • FIG. 10 is an enlarged view inside the dotted circle in FIG.
  • the term “large” here refers to a screen size of 20 inches or more.
  • the present invention can also be applied to a liquid crystal display having a screen size of 20 inches or less.
  • FIG. 1 is a longitudinal sectional view of a large liquid crystal display 100 according to a first embodiment of the present invention, in which lateral force is also seen.
  • the large liquid crystal display 100 includes a liquid crystal panel 1, hot cathode fluorescent lamps 2 a and 2 b, a light guide plate 3, reflectors 4 a and 4 b, and a light guide unit (semi-transmissive reflection means) 5.
  • liquid crystal panel 1 Since the liquid crystal panel 1 is not directly related to the present invention, the description thereof is omitted.
  • the two hot-cathode fluorescent lamps 2a and 2b are light sources of the knock light unit, and are substantially parallel to each other (so as to be substantially parallel), so that the upper end surface of the light guide plate And along the bottom edge (along the front and back in Fig. 1).
  • the light guide plate 3 is made of transparent resin, such as acrylic resin, methallyl resin, polycarbonate, etc., and the front surface (right side in the figure) is a flat surface (rectangular) and the back surface (left side in the figure) is concave. It is a curved surface.
  • the upper end surface and the lower end surface facing the fluorescent lamps 2a and 2b bulge into a convex lens shape (kamaboko-type) by facing the fluorescent lamps 2a and 2b, respectively.
  • the back surface of the light guide plate 3 is coated with a reflection film for totally reflecting light, for example, a film mainly composed of aluminum.
  • the reflectors 4a and 4b are made of, for example, resin and are lightweight, and a reflective film similar to the above reflective film is coded on the inner surface. These reflectors 4a and 4b reflect the light emitted from the fluorescent lamps 2a and 2b so as to enter the upper and lower end surfaces of the light guide plate 3.
  • the light guide unit 5 causes a part of the light that has entered the light guide plate 3 to travel to the surface force liquid crystal panel.
  • the white light emitted from the fluorescent lamps 2a and 2b is light-guided with a narrowed (thinned) central part.
  • the light directly enters the upper end surface or the lower end surface of the plate 3 or is reflected by the reflecting films of the reflectors 4 a and 4 b and enters the upper end surface or the lower end surface of the force light guide plate 3.
  • the upper and lower end surfaces of the light guide plate 3 have a convex shape (three-dimensional force bulge) projecting toward the fluorescent lamps 2a and 2b. With this shape, white light from the fluorescent lamps 2a and 2b is uniformly irradiated on the back surface of the liquid crystal panel 1. This will be described with reference to FIGS. 2 (a) and (b).
  • FIG. 2 (a) shows how white light travels when the end face of the light guide plate 3 in the large liquid crystal display 100 is flat (not convex)
  • Fig. 2 (b) is an explanatory diagram showing how white light travels when the end face of the light guide plate 3 is convex.
  • the amount of light reaching the portion with a small thickness can be reduced when the back surface of the light guide plate 3 is a concave curved surface. It can be increased and the entire LCD panel can be illuminated uniformly.
  • the thickness of the light guide plate 3 can be reduced to near the end portion, and a lighter weight can be achieved.
  • the white light incident on the light guide plate 3 from the upper end surface and the lower end surface repeats total reflection on the front and back surfaces of the light guide plate 3 and travels through the light guide plate 3, and a part of the white light is connected to the liquid crystal panel 1.
  • the light is guided to the liquid crystal panel 1 by the light guide portion 5 disposed between the light guide plate 3 and the light guide plate 3.
  • the operation of the light guide 5 will be described with reference to Fig. 3 in which the inside of the dotted circle C3 in Fig. 1 is enlarged.
  • a fine structure microlens structure
  • the light guide unit 5 is made of the same material as that of the light guide plate 3, and the light travels without being reflected at the portion where the light guide unit 5 contacts.
  • part of the white light that travels by repeatedly reflecting inside the light guide plate 3 passes through the contact point with the light guide unit 5 and proceeds into the light guide unit 5.
  • light guide Due to the fine structure of the part 5 the light that has entered the light guide part 5 enters the liquid crystal panel 1 almost perpendicularly.
  • silver metal 800, aluminum, etc. have high reflectivity!
  • a reflective material such as a reflective polycarbonate may be provided.
  • Examples of members that can be used for the light guide 5 include, for example, the trade name “Mirabulite” (Kuraray Co., Ltd.) described in Electronic Materials, May 2000 issue separate volume, pages 98 to 101. Made).
  • the back surface of the light guide plate 3 is a concave curved surface, so that it is lighter than a conventional light guide plate having the same maximum thickness and a V-shaped groove structure. It becomes possible.
  • FIG. 4 is a configuration diagram of the large liquid crystal display 300 as viewed from the front. In FIG. 4, only the liquid crystal panel 31 and the fluorescent lamps 32a and 32b are shown.
  • the basic configuration of the large liquid crystal display 300 is the same as that of the large liquid crystal display 100 according to the first embodiment.
  • two fluorescent lamps 32a and 32b are used to irradiate the back surface of the liquid crystal panel 31 with white light using a light guide plate (not shown) or the like.
  • the diameters of the intermediate portions connecting the two end portions are smaller than the diameters of the electrodes 33a, 33b, 33c and 33 (one portion thereof) at both end portions.
  • a light guide plate (not shown) used to guide white light emitted from the fluorescent lamps 32a and 32b to the back surface of the liquid crystal panel 31.
  • the outer diameter of the intermediate portion (the thin portion between the electrodes) of the fluorescent lamps 32a and 32b can be 1Z2 (for example, 15 mm) at both ends.
  • the diameter of the intermediate portion of the fluorescent lamps 32a and 32b can be reduced to about 1Z2 of a conventional fluorescent lamp having the same performance (brightness and power consumption).
  • FIG. 5 is a longitudinal sectional view of the large liquid crystal display 400 as seen from the side.
  • the large liquid crystal display 400 includes a liquid crystal panel 41, fluorescent lamps 42a and 42b, a light guide plate 43, a light guide unit 45, and reflectors 46a and 46b.
  • the basic configuration is the same as that of the first embodiment. It is the same as the large liquid crystal display. However, the shape force of the reflectors 46a and 46b is different from the reflectors 4a and 4b of the large liquid crystal display according to the first embodiment, and the shape of the back surface of the light guide plate 43 is also different from that of the light guide plate 3. And
  • two fluorescent lamps 42 a and 42 b are used to irradiate the back surface of the liquid crystal panel 41 with white light using the light guide plate 43.
  • Some of the white light emitted from the respective fluorescent lamps 42a and 42b is directly incident on the light guide plate 43, and some of the white light is reflected by the reflectors 46a and 46b and the force is also incident on the light guide plate 43.
  • the cross-sectional shapes of the reflectors 46a and 46b are each a double circle. That is, it has a shape in which two circles are connected. The connection point of the two circles is located on the opposite side of the light guide plate 43 with respect to the fluorescent lamps 42a and 42. According to this configuration, the proportion of the white light radiated from the fluorescent lamps 42a and 42b that first proceeds in the direction opposite to the light guide plate 43 proceeds into the light guide plate 43 is improved. In other words, when the simple circular reflectors 2a and 2b shown in Fig. 1 are used, if the light traveling in the opposite direction to the light guide plate is reflected by the reflector, the rate of directing the lamp again is high. As a result, it is absorbed in the lamp and lost.
  • a double circle as in this embodiment, the loss due to re-incident on this lamp can be reduced, and as a result, the utilization efficiency of white light from the lamp is improved by about 10%. it can.
  • a double circle is used. However, one or both may be a double ellipse.
  • an ellipse having an eccentricity of about 0.95 is adopted as the shape of the back surface of light guide plate 43, that is, the reflective surface on the left side of the drawing.
  • the reason for adopting such an elliptical shape with a high flatness ratio is that the thickness of the light guide plate 43 becomes narrower as it goes from the end to the center than the circular shape. We can reduce 43 weight more Power.
  • FIG. 6 is a longitudinal sectional view of the large liquid crystal display 500 as viewed from the side.
  • the large liquid crystal display 500 includes a liquid crystal panel 51, fluorescent lamps 52a and 52b, a light guide plate 53, a light guide 55, and reflectors 56a and 56b.
  • the basic configuration is the same as that of the first embodiment. It is the same as the large liquid crystal display.
  • the large liquid crystal display 500 is intended to significantly reduce the weight of the light guide plate 53. Compared to the large liquid crystal display 100 shown in FIG. It is long.
  • the reflectors 56a and 56b which are longer in the vertical direction than the reflectors 2a and 2b are used.
  • the widths of the openings of the reflectors 56a and 56b are smaller than the diameters of the fluorescent lamps 52a and 52b.
  • the width of the end portion of the light guide plate 53 can be reduced. it can. According to this, since the light guide plate 53 can be made thin, the weight can be reduced. According to the present embodiment, it is possible to reduce the cost because the amount of expensive polycarbonate generally used for the light guide plate can be reduced because the large liquid crystal display itself can be lightened as much as possible.
  • FIG. 7 is a longitudinal sectional view of the large liquid crystal display 600 viewed from the side.
  • the large liquid crystal display 600 includes a liquid crystal panel 61, fluorescent lamps 62a and 62b, a light guide plate 63, a light guide unit 65, and reflectors 66a and 66b.
  • the basic configuration is the same as that of the fourth embodiment. It is the same as the large liquid crystal display.
  • the height of the entire display which is long in the vertical direction of the reflectors 56a and 56b, becomes high. Therefore, in the large liquid crystal display 600 according to the present embodiment, the fluorescent lamps 62a and 62b are installed so as not to occur.
  • the rear surface of the light guide plate 63 is used, and the reflectors 66a and 66b are used to guide the white light of the light lamps 62a and 62b to the upper and lower end surfaces of the light guide plate.
  • the light rays from the fluorescent lamp 62a indicated by the dotted line in the figure are reflected by the back surface of the light guide plate 63 and the side surface of the reflector 66a, proceed to the tip of the reflector 66a, and are arranged so as to be perpendicular to each other.
  • the light is reflected twice by the two planes, and proceeds into the light guide plate 63.
  • the length of the entire display in the vertical direction can be made smaller than that in the first embodiment, and the same as in the fourth embodiment.
  • the light weight can be realized.
  • FIG. 8 is a longitudinal sectional view of the large liquid crystal display 700 viewed from the side.
  • the large liquid crystal display 700 includes a liquid crystal nonel 71, fluorescent lamps 72a and 72b, light guide plates 73a, 73b and 73c, a light guide portion 75, reflector reflectors 76a and 76b, and partial transmission plates 77a and 77b.
  • two fluorescent lamps 72a and 72b are arranged on the back side of the liquid crystal panel 71. That is, the fluorescent lamps 72a and 72b are accommodated in a groove formed by the light guide plates 73a, 73b, and 73c divided into three parts. White light from the fluorescent lamps 72a and 72b is irradiated to the entire back surface of the liquid crystal panel 71 by the light guide plates 73a, 73b and 73c.
  • the end surfaces of the light guide plates 73a, 73b and 73c facing the fluorescent lamps 72a and 72b are flat, but may be convex as in the case of the first embodiment.
  • the triangular reflectors 76a and 76b arranged on the opposite side to the liquid crystal panel 71 with respect to the fluorescent lamps 72a and 72b are opposite to the liquid crystal panel 71 in the white light emitted from the fluorescent lamps 72a and 72b.
  • the object traveling in the direction of is reflected upward or downward.
  • the white light easily enters the light guide plates 73a, 73b, and 73c.
  • the space between the fluorescent lamps 72a and 72b and the liquid crystal nonel 71 is provided with partial transmission plates 77a and 77b force S.
  • the partial transmission plates 77a and 77b allow a part of white light traveling in the direction of the liquid crystal panel 71 from the fluorescent lamps 72a and 72b to directly enter the liquid crystal panel 71.
  • the partial transmission plates 77a and 77b for example, polycarbonate mixed with titanium oxide can be used. It is known that when titanium oxide is mixed in polycarbonate, white light is reflected with high reflectivity (diffuse reflection). For example, by reducing the thickness to about 0.1 mm, Partially white light can be transmitted.
  • highly reflective polycarbonate (trade name: Iupilon) manufactured by Mitsubishi Engineering Plastics is commercially available.
  • the light guide plate is divided into three, but a groove for accommodating the fluorescent lamp may be formed without being divided.
  • a partial transmission plate is provided on the bottom surface of the groove.
  • FIG. 9 is a longitudinal sectional view of large liquid crystal display 1000 according to the present embodiment.
  • the large liquid crystal display 1000 includes a liquid crystal nonel 1001, fluorescent lamps 1002a and 1002b, a transparent plate 1003, reflectors 1004a, 1004b and 1004c, and a light guide unit 1005.
  • the reflectors 1004a, 1004b, and 1004c are used for guiding the white light also radiated by the two fluorescent lamps 1002a and 1002b to the back of the liquid crystal nonre 1001. Yes. That is, in this embodiment, the reflectors 1004a, 1004b, and 1004c reflect the white light of the fluorescent lamps 1002a and 1002b, pass through the transparent plate 1003, and are guided from the light guide unit 1005 to the liquid crystal panel 1001. It has become.
  • the reflectors 1004a, 1004b, and 1004c are made of, for example, resin and have a reflective film formed on the inner surface. These reflectors are lightweight because they can be made very thin compared to the light guide plate.
  • the reflectors 1004a, 1004b, and 1004c are divided into three forces for reasons of manufacturing, etc. These reflectors may be manufactured integrally.
  • the cross-sectional shapes of the reflectors 1004a and 1004b are circular, but may be a double circle as shown in FIG.
  • FIG. 10 a partially enlarged view within a dotted circle C10 in FIG. 9 is shown in FIG.
  • the light guide 1005 disposed between the transparent plate 1003 and the liquid crystal panel 1001 has a fine structure on the surface facing the transparent plate 1003, and a silver plating 1006 is formed in the gap.
  • a reflective member such as a highly reflective metal such as aluminum or a highly reflective polycarbonate is provided.
  • the light guide plate is unnecessary, for example, the light guide as shown in FIG. Compared with the method using a plate, the weight can be significantly reduced.
  • this embodiment when the light guide portion 1005 having a large number of protrusions is brought into contact with the transparent plate 1003 and a reflector such as silver plating is arranged in the gap between them, this embodiment In addition to the case where two fluorescent lamps are used as described above, it can be applied to general knocklights using a large number of cold cathode fluorescent lamps.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

L'affichage large à cristaux liquides (100) selon l'invention comprend une plaque de guidage de lumière (3) disposée sur la face arrière d’un panneau à cristaux liquides (1). La surface avant de la plaque de guidage de lumière (3) est plane, tandis que sa surface arrière est concave. Les faces supérieure et inférieure de la plaque de guidage de lumière (3) faisant respectivement face à des lampes fluorescentes à cathode chaude (2a, 2b) présentent une forme convexe se projetant vers les lampes respectives. La lumière blanche provenant des lampes fluorescentes est incidente sur les faces d’extrémité supérieure et inférieure de la plaque de guidage de lumière directement ou en étant réfléchie par des réflecteurs (4a, 4b), et se propage à l’intérieur de la plaque de guidage de lumière tout en étant réfléchie par les surfaces avant et arrière de la plaque de guidage de lumière. Sur la surface avant de la plaque de guidage de lumière, une partie de la lumière blanche est dirigée vers la face arrière du panneau à cristaux liquides (1) par une portion de guidage de lumière (5).
PCT/JP2006/315998 2005-08-26 2006-08-14 Affichage à cristaux liquides et plaque de guidage de lumière WO2007023703A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US11/990,751 US8130340B2 (en) 2005-08-26 2006-08-14 Liquid crystal display and light guide plate
CN2006800303347A CN101243355B (zh) 2005-08-26 2006-08-14 液晶显示器及导光板

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-245809 2005-08-26
JP2005245809A JP4895158B2 (ja) 2005-08-26 2005-08-26 液晶ディスプレイ

Publications (1)

Publication Number Publication Date
WO2007023703A1 true WO2007023703A1 (fr) 2007-03-01

Family

ID=37771453

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/315998 WO2007023703A1 (fr) 2005-08-26 2006-08-14 Affichage à cristaux liquides et plaque de guidage de lumière

Country Status (6)

Country Link
US (1) US8130340B2 (fr)
JP (1) JP4895158B2 (fr)
KR (1) KR100914875B1 (fr)
CN (1) CN101243355B (fr)
TW (1) TWI391749B (fr)
WO (1) WO2007023703A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010002487A (ja) * 2008-06-18 2010-01-07 Hitachi Displays Ltd 液晶表示装置
KR20120074825A (ko) * 2010-12-28 2012-07-06 엘지전자 주식회사 디스플레이 장치
CN103090313A (zh) * 2011-11-07 2013-05-08 康佳集团股份有限公司 可提高led灯入光效率的导光板
JP6130164B2 (ja) * 2012-08-07 2017-05-17 株式会社エンプラス 面光源装置および表示装置
KR102009855B1 (ko) * 2012-09-18 2019-08-13 엘지디스플레이 주식회사 도광판
JP6064283B2 (ja) * 2013-03-29 2017-01-25 パナソニックＩｐマネジメント株式会社 照明装置
US9684115B1 (en) * 2014-04-11 2017-06-20 Cooper Technologies Company Light fixtures with waveguides
CN104297999B (zh) * 2014-09-26 2017-07-04 京东方科技集团股份有限公司 液晶模组和曲面显示装置
CN104464523B (zh) * 2015-01-06 2017-03-15 京东方科技集团股份有限公司 曲面显示装置
KR20170075896A (ko) 2015-12-23 2017-07-04 삼성디스플레이 주식회사 표시 장치
US10288797B1 (en) * 2016-10-24 2019-05-14 Amazon Technologies, Inc. Structural alignment features for light emitting diode arrays
CN106322252A (zh) * 2016-11-21 2017-01-11 深圳市鼎高光电产品有限公司 一种曲面导光板及带有曲面导光板的侧发光面板灯
KR20190079727A (ko) * 2017-12-27 2019-07-08 삼성디스플레이 주식회사 표시 장치

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62158427U (fr) * 1986-03-31 1987-10-08
JPH0453220U (fr) * 1990-09-07 1992-05-07
JPH04257824A (ja) * 1991-02-13 1992-09-14 Sumitomo Chem Co Ltd エッジライト型照明装置
JPH0515309U (ja) * 1991-04-25 1993-02-26 松下電工株式会社 細形熱陰極蛍光ランプ
JPH06160638A (ja) * 1992-11-24 1994-06-07 Stanley Electric Co Ltd 照明装置及びその製造方法
JP2002075036A (ja) * 2000-08-31 2002-03-15 Hitachi Ltd 面状照明装置及びこれを備えた表示装置

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5816677A (en) 1905-03-01 1998-10-06 Canon Kabushiki Kaisha Backlight device for display apparatus
JPS62158427A (ja) * 1986-01-07 1987-07-14 井関農機株式会社 コンバイン
JPH0453220A (ja) * 1990-06-20 1992-02-20 Nikon Corp 投影光学装置
JPH0588166A (ja) * 1991-09-30 1993-04-09 Fujitsu Ltd 表示装置のバツクライトユニツト
JPH07270618A (ja) * 1994-03-30 1995-10-20 Toshiba Lighting & Technol Corp 照明装置およびこれを含む液晶表示装置
JPH08221013A (ja) 1994-12-15 1996-08-30 Sony Corp 平面表示装置および平面表示装置用バックライト装置
TW373116B (en) * 1994-12-15 1999-11-01 Sharp Kk Lighting apparatus
JPH08194222A (ja) * 1995-01-17 1996-07-30 Kodaka Kogyo Kk 照明装置
JPH08293205A (ja) * 1995-01-20 1996-11-05 Toshiba Lighting & Technol Corp 光源装置とその点灯装置およびバックライトならびに液晶表示装置
JPH0982123A (ja) * 1995-09-11 1997-03-28 Hitachi Ltd 液晶表示装置
US5980054A (en) * 1996-05-09 1999-11-09 Matsushita Electric Industrial Co., Ltd. Panel-form illuminating system
KR100414882B1 (ko) * 1996-09-25 2004-05-31 삼성전자주식회사 광균일성을위한액정표시장치의백라이트구조
US5995690A (en) 1996-11-21 1999-11-30 Minnesota Mining And Manufacturing Company Front light extraction film for light guiding systems and method of manufacture
KR19990002472A (ko) * 1997-06-20 1999-01-15 손욱 면광원장치
KR19990009044A (ko) 1997-07-07 1999-02-05 윤종용 백라이트 어셈블리 구조
JP3515355B2 (ja) 1998-02-10 2004-04-05 三洋電機株式会社 液晶表示装置
JPH11306833A (ja) * 1998-04-20 1999-11-05 Mitsubishi Chemical Corp 面照明装置
JP2000187211A (ja) 1998-12-24 2000-07-04 Sharp Corp 液晶表示装置
KR100313212B1 (ko) * 1999-03-03 2001-11-05 이봉원 도광판 백라이트 광입사장치
KR100291065B1 (ko) 1999-03-05 2001-05-15 김재우 포말분리법에 의한 폐,하수 고도처리방법
JP2001228477A (ja) 2000-02-15 2001-08-24 Sakae Tanaka 液晶表示素子の製造方法とバックライト
JP2001312213A (ja) * 2000-04-26 2001-11-09 Internatl Business Mach Corp <Ibm> バックライトユニット、液晶表示装置、ならびに導光板の製造方法
JP2001332115A (ja) * 2000-05-25 2001-11-30 Mitsubishi Rayon Co Ltd バックライト装置及びこれを用いた液晶表示装置
US6502947B2 (en) * 2001-03-30 2003-01-07 Mitsubishi Rayon Co., Ltd. Planar light source device and liquid crystal display apparatus
KR20040012393A (ko) 2002-08-03 2004-02-11 삼성전자주식회사 백라이트 어셈블리 및 이를 갖는 액정 표시 장치
TW575722B (en) * 2002-09-02 2004-02-11 Hannstar Display Corp Planar light source device and liquid crystal display
US6808281B2 (en) * 2002-12-14 2004-10-26 Quanta Display Incorporation Backlight module having concave struture
EP1788302A4 (fr) * 2004-09-06 2011-08-24 Fujifilm Corp Unité de réglage de transmittance, dispositif d'éclairage plan, dispositif d'affichage a cristaux liquides utilisant ledit dispositif et procédé de disposition de systeme de réglage de transmittance

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62158427U (fr) * 1986-03-31 1987-10-08
JPH0453220U (fr) * 1990-09-07 1992-05-07
JPH04257824A (ja) * 1991-02-13 1992-09-14 Sumitomo Chem Co Ltd エッジライト型照明装置
JPH0515309U (ja) * 1991-04-25 1993-02-26 松下電工株式会社 細形熱陰極蛍光ランプ
JPH06160638A (ja) * 1992-11-24 1994-06-07 Stanley Electric Co Ltd 照明装置及びその製造方法
JP2002075036A (ja) * 2000-08-31 2002-03-15 Hitachi Ltd 面状照明装置及びこれを備えた表示装置

Also Published As

Publication number Publication date
JP4895158B2 (ja) 2012-03-14
US20090103009A1 (en) 2009-04-23
KR100914875B1 (ko) 2009-08-31
CN101243355A (zh) 2008-08-13
CN101243355B (zh) 2011-12-14
TWI391749B (zh) 2013-04-01
TW200722865A (en) 2007-06-16
JP2007059316A (ja) 2007-03-08
US8130340B2 (en) 2012-03-06
KR20080036204A (ko) 2008-04-25

Similar Documents

Publication Publication Date Title
WO2007023703A1 (fr) Affichage à cristaux liquides et plaque de guidage de lumière
US8136955B2 (en) Illumination system and display including same
WO2007029858A1 (fr) Dispositif d’éclairage de surface et unité de source de lumière utilisant celui-ci
US8220979B2 (en) Light guide plate and backlight module
JPH09274807A (ja) 液晶用バックライト
US7134777B2 (en) Surface lighting device with closed oblique reflector
US20030039113A1 (en) Lighting unit
US6132053A (en) Optimized highly efficient large area modular flat panel display lighting device
US20060044832A1 (en) Light guide plate and backlight module employing the same
JP2003100134A (ja) 面状照明装置
JP2006048968A (ja) 面光源装置及び液晶ディスプレイ
JP2005302659A (ja) 照明装置及びそれを備えた表示装置
JP2002329403A (ja) 表示装置用の照明装置及びこれを備えた表示装置
JPH09211234A (ja) 照明装置および液晶表示装置
KR101278940B1 (ko) 박막 트랜지스터 액정표시장치의 백라이트 장치
JP2007335209A (ja) 面状照明装置
TWM332206U (en) Optical waveguide plate and backlight module
JP2004227963A (ja) 線状導光体、照明装置および液晶表示装置
JP2006054126A (ja) 面光源装置
HU224262B1 (hu) Lapos világítótest
JP2004139901A (ja) 照明装置
KR20190122278A (ko) 광 확산 구조체 및 이를 포함하는 백라이트 유닛
JP2004163887A (ja) 液晶表示器用バックライト装置
JP2001345009A (ja) 表示装置
TWI383423B (zh) 燈管、背光模組及液晶顯示裝置

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200680030334.7

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 11990751

Country of ref document: US

Ref document number: 1020087004218

Country of ref document: KR

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 06782732

Country of ref document: EP

Kind code of ref document: A1